Telephone users sometimes complain about unreliable service and　　　they consider unfair charges

_____ you talk to or write a message to someone, you show your language skills to others.

It’shigh time you had your hair cut ; it’s getting .

Practising Chinese kung fu can not only _____ one’s strength, but also develop one’s character.

Onlywhenonelosesfreedom _______itsvalue .